About our e-newsletters
- Free e-newsletters
- Mayo Clinic expertise
- We do not share your e-mail address
Housecall, our weekly general-interest e-newsletter, keeps you up to date on a wide variety of health topics with timely, reliable, practical information, recipes, blogs, questions and answers with Mayo Clinic experts and more. Our biweekly topic-specific e-newsletters also include blogs, questions and answers with Mayo Clinic experts, and other useful information that will help you manage your health.
Housecall Archives
Mayo Clinic Housecall
Stay up to date on the latest health information.
What you get
- Free weekly e-newsletter
- Mayo Clinic expertise
- Recipes, tools and other helpful information
- We do not share your e-mail address
Causes
By Mayo Clinic staffLike any allergy, mold allergy symptoms are triggered by an overly sensitive immune system response. When you inhale tiny, airborne mold spores, your body recognizes them as foreign invaders and develops allergy-causing antibodies to fight them.
After the exposure has passed, you still produce antibodies that "remember" this invader, so that any later contact with the mold causes your immune system to react. This reaction triggers the release of substances such as histamine, which cause itchy, watery eyes, runny nose, sneezing and other mold allergy symptoms.
Molds are very common both inside and outside. There are many different types, but only certain kinds of mold cause allergies. Being allergic to one type of mold doesn't necessarily mean you'll be allergic to another. Some of the most common molds that cause allergies include alternaria, aspergillus, cladosporium and penicillium.
When it's not an allergy
Although a mold allergy is the most common problem caused by exposure to mold, mold can cause illness without causing an allergic reaction. Mold can also cause infections, or irritant and toxic reactions. Infections caused by mold can cause a variety of problems from flu-like symptoms, to skin infections and even pneumonia.
An irritant reaction is caused when substances from molds called volatile organic compounds irritate the mucous membranes in the body. Symptoms of an irritant reaction are similar to an allergy and include eye irritation, runny nose, cough, voice hoarseness, headache and skin irritation. With a mold allergy, your symptoms will generally get progressively worse with each exposure to mold, while an irritant reaction doesn't get worse.
A toxic reaction to mold is caused by eating, drinking or inhaling substances called mycotoxins. As with an irritant reaction, the symptoms of a toxic reaction may also include flu-like symptoms, eye and skin irritation, and breathing troubles. You may also experience headaches, nervousness, dizziness, difficulty concentrating and extreme fatigue if you're having a toxic reaction to mold.
- Storey E, et al. Guidance for clinicians on the recognition and management of health effects related to mold exposure and moisture indoors. The Center for Indoor Environments and Health. http://oehc.uchc.edu/images/PDFs/MOLD%20GUIDE.pdf. Accessed June 8, 2010.
- Mold allergy. Asthma and Allergy Foundation of America. http://www.aafa.org/display.cfm?id=8&sub=15&cont=58. Accessed June 7, 2010.
- Basic facts: Molds in the environment. U.S. Centers for Disease Control and Prevention. http://cdc.gov/mold/faqs.htm. Accessed June 7, 2010.
- A brief guide to mold, moisture and your home. Environmental Protection Agency. http://www.epa.gov/mold/moldguide.html. Accessed June 7, 2010.
- Atopic and allergic disorders. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/print/sec13/ch165/ch165c.html. Accessed June 9, 2010.
- Weber RW. Allergic Rhinitis. Primary Care Clinics in Office Practice. 2008;35:1.
- Tips to remember: Allergy and asthma medications. American Academy of Allergy, Asthma and Immunology. http://www.aaaai.org/patients/publicedmat/tips/asthmaallergymedications.stm. Accessed June 9, 2010.
- Seltzer JM, et al. Health effects of mold in children. Pediatric Clinics of North America. 2007;54:309.
- Saline sinus rinse recipe. American Academy of Allergy, Asthma and Immunology. http://www.aaaai.org/patients/publicedmat/sinusitis/rinse_recipe.pdf. Accessed June 9, 2010.
- Li JT (expert opinion). Mayo Clinic, Rochester, Minn. June 21, 2010.
Find Mayo Clinic on